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CVE-2021-24559: qyrr vulnerability
CVE-2021-24559: medium vulnerability affecting qyrr. Check CVSS, KEV status, business impact and recommended administrator actions.
- CVSS
- 5.4 MEDIUM
- EPSS
- 12.41%
- Known exploited
- not in KEV
- Product
- qyrr
What is known
The Qyrr WordPress plugin before 0.7 does not escape the data-uri of the QR Code when outputting it in a src attribute, allowing for Cross-Site Scripting attacks. Furthermore, the data_uri_to_meta AJAX action, available to all authenticated users, only had a CSRF check in place, with the nonce available to users with a role as low as Contributor allowing any user with such role (and above) to set a malicious data-uri in arbitrary QR Code posts, leading to a Stored Cross-Site Scripting issue.
Business impact
Successful exploitation of CVE-2021-24559, a medium vulnerability (CVSS 5.4) affecting qyrr, may affect the confidentiality, integrity or availability of the vulnerable environment. The exact impact depends on the installed version, exposed interfaces and deployment configuration.
Recommended administrator action
Confirm whether qyrr is present and compare installed versions with the vendor advisory and NVD record. Apply the vendor patch or documented mitigation; until remediation is complete, reduce exposure of affected interfaces, review relevant logs and monitor for indicators of exploitation. DataHouse can support version verification, managed patching, network exposure reduction, log review and backup validation for dedicated, cloud and colocated environments.